Dwyer HM28 User Manual
Page 12
12
4.3
Power supply unit connection
The HM28 can be operated by a regulated
plug-in power supply unit.
Input
115V, 60 Hz
Output
9 V DC ± 20 %, 100 mA
(7 to 14 V DC)
5
Maintenance
The HM28 requires no maintenance. It can be
cleaned with a damp cloth. Do not use cleaning
agents containing solvents!
See the relevant chapters for battery change
and recalibration.
Metric Range
English Range
Max. load capacity
Max. static pressure
(rounded)
0 ... 2.5
kPa 0 ... 10
inH2O
12.5
kPa
50
inH2O
700
kPa
100 psid
0 ... 7
kPa 0 ... 28
inH2O
35
kPa
140
inH2O
700
kPa
100 psid
0 ... 20
kPa 0 ... 80
inH2O
150
kPa
600
inH2O
700
kPa
100 psid
0 ... 30
kPa 0 ... 120
inH2O
150
kPa
600
inH2O
700
kPa
100 psid
0 ... 50
kPa 0 ... 200
inH2O
400
kPa
1600 inH2O
700
kPa
100 psid
0 ... 100
kPa 0 ... 14.5 psid/g
400
kPa
58
psid/g
700
kPa
100 psid
0 ... 110
kPa 0 ... 15.9 psia
400
kPa
58
psia
--
--
0 ... 200
kPa 0 ... 29
psia/d/g 700
kPa
100
psia/d/g 700
kPa
100 psid
0 ... 700
kPa 0 ... 100
psia/d/g 1700
kPa
245
psia/d/g 1700 kPa
245 psid
0 ... 1000 kPa 0 ... 145
psid/g
2700
kPa
390
psid/g
2700 kPa
390 psid
0 ... 1700 kPa 0 ... 245
psid/g
2700
kPa
390
psid/g
2700 kPa
390 psid
0 ... 3000 kPa 0 ... 435
psig
7000
kPa
1000 psig
--
--
0 ... 7000 kPa 0 ... 1000 psig
14000 kPa
2000 psig
--
--
4.2
Measuring ranges
The maximum load capacity applies for
relative overpressure and negative
pressure. The instrument is calibrated
from 0 to100% of the measuring
range. Exceeding or underrunning this
range by up to about 10% is still
displayed.
Differential pressure sensors (d)
doesn’t measure the same value on
the P and S side mandatorily because
of her geometry.
Conversion factors
1 mbar
= 0,1
kPa
1 mbar
= 0,0010
bar
1 mbar
= 10,20
mmH
2
O
1 mbar
= 0,7501
mmHg
1 mbar
= 0,0145
psi
1 mbar
= 0,4015
inH
2
O
1 mbar
= 0,02953 inHg
1 mbar
= 1,0
hPa
a = absolute pressure
d = differential pressure
g = relative pressure
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